Bending-machine.



0. E. ANDERSON.

BENDING MAGHINE.

APPLICATION FILED JUNE 13, 1911.

Patented N0v.14, 1911.

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- add A HNE GS G. E. ANDERSON.

BENDING- MACHINE.

APPLICATION FILED JUNE 13,1911.

Patented Nov. 14, 1.911.

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fiESSES:

G. E. ANDERSON.

BBNDING MACHINE.

APPLIOATION FILED 1111111 13, 1911.

5 BHEETS-BKEET E.

C. E. ANDERSON.

BENDING MAUHINE.

urmcmxon IILIJD mm 13, 1911,

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Patented Nov.

5 SHEETS 5] mac M00 6? W- c. E. ANDERSON.

Patented N0v. 14, 191 1.

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INVENTUI? 1 -M WM 1 I 4 w 1. I 1 0 N kw 8 W X, was M m I 1 h 0 m W I 1ATTORM 'YS CARL E. ANDERSON, 01" EAST ORANGE, NEW JERSEY.

BENDING-IACHINE.

Specification of Letters Patent. Applieation filed June 13, 1911. SerialNo. 688,989.

Patented Nov. 14, 1 911.

To all whom it may concern:

Be it known that I, CARL E. Ammnson, a citizen of the United States,residing at East Orange, in the count of Essex and 5 State of NewJersey, have invented certain new and useful Improvements in Bending-Machines; and I do hereby declare the fo lowin to be a full, clear, andexact description of the invention, such as will en- 1 able othersskilled in the art to which it appertains to make and use the same,reference being had to the accompanying drawings, and to fi res ofreference marked thereon, which orm a part of this specification.

This invention relates to a machine which receives the substantiallyU-shaped strips of soft metal, preferably copper, and bends these stripsinto armature coils.

Armature coils .are made in different forms, some diverging from theirclosed end and after being bent outward are brought together again atthe other end, and in 0 ers the loo ed end of the U-shaped strip isheld, and t e strips are bent apart into parallel -strands, and thetermination of these strands are bent still farther apart and then intoparallel ends. These diiferent types of coils are used when differentwindlngs are em loyed in 'the armatures. It is necessary w en makingthese coils to bend them apart varying distances according to thediameter ofthe armature, and the coils have their side strands arrangedatdifierent angles, depending on the number of coils that are placed1nto an armature. It hasbeencustomary heretofore in making these coilsto form a block usually of metal over which the strips are placed andhammered by a hammer or mallet into the required shape. This takes timeand is therefore expensive. Under this old systemit has beennecessarywhen a special type of armature is to be made to make a new block, andthe block with its consequent finishing is eaiensive and also retards:the befi'nning of e work. y im roved machine is adjustable so as to.make ifi'erent t "of coils, that is, the coils that diverge from oneend toward the other with the parallel strands at the sides as shown inFi 9 of the drawing, and to also make the arm of armature cell which isclosed at its"- ends as shown in Fi 11. u The ach s'als d ig e at eregu-.

lated so as to provide diflerent degreus for the difi'erent coils, thatis, the side strands are inclined according to the radius of thearmature into which they are to be laced. The machine is also designedto ta different thicknesses of metallic strips which are to beformed'into coils. chine the insertion and removal of the :;tri into themachine is easy and quick and t e coils can be bent in rapid succession,thereby making them cheap.

The invention is illustrated in the a1 :companying drawin Fig. l is aside view of the maahin with part of the mechanism shown ir, section. Fi2 is an end view with the lever, for holdin the end of the armatureremoved, an showing'the levers for bending the strip in their closed ornormal position. Fig. 3 1s a view similar-toFig. 2 showing the leversdrawn apart to bend the utrip. Fig. 4 is a section on line 4-4, in Fig.1 with the levers embracing the ends 015 the strip forming the coil intheir closed. 0- sitions, and Fig. 5 is a similar view with these leversforced apart. Fi 6 is a top view of Fig. 1. Fi 7 is a etail oi one ofthe chucks for olding the strip and which can be ad'usted to vary theangle of the side strands of the coil. Fig, 8 is a to view of Fig. 7.Fig. 9' is a top view of t e machine similar to Fig. 6, but slowing thestrip bent into an armature coil.

s in which In this ma- Fig. 10 is an end view of the top part of a themachine showing the attachment which is inserted in the 'machine whenthe ends of the strip from which the coil is formed are to be held aainst separation. Fig. 11 is a top view 0 an armature coil foimed fromthe strip when its ends are held against separation. a

The machine comprises legs 10 and, 11. one at each end 'of the M ne,supporting a frame 12 which extends the leg 10 to the leg 11 and reststhereon the two upright ends of the frame 12 being ormed into learings13 and 1.4, in which bearings is arranged a shaft 15, the frame alsobeing pm.- vided withside stri s 16 as shown inl 4 and 5,. One end 0 theframe 12 isfor med into a bracket 17 provided with par illel guides 18which are recessed as at 19 to hold an end-block 20 in slidin% relationth erewith. A stop-plate 21 bn gas the ends of 18, and nuts}? and 23 arepl:

on a screw 24, which screw is attached to the end-block 20 and slidesfreely through a perforation in the stop-plate 21, the nuts acting tolimit the movement of the screw 24 and consequently of the end-block 20,a thread on the screw providing for the adjustment of the nuts accordingto the size and the form of armature coil to be bent, as will behereinafter described. The end-block 20 is provided with cheek-pieces 25which are perforated in line to receive a pin 26 having the finger-piece27 The strip of material which is supplied in a U-shape, with a narrowloo on one end and parallel strands extendmg therefrom, is placed withits 100 ed end 28 between the cheek pieces 25 an then the pin 26 isinserted to hold that end. This insertion is done when the machine is inthe position shown in Fi 6 withthe nut 22 back a ainst the stop-p ate 21and the two stran s of the strip are placed in the blocks which areadapted to separate or bend them apart.

On the shaft 15 are arranged a pair of levers 29 and 30 which aremounted on the shaft so that they swingthereon and to opposite sides 'ofthe machine, being provided with blocks '31 which are adapted to slideon the rods 32 and bei held against turning by the keys 33 and eld in eagem'ent wlth the rods by means of the b0 ts 34, as will be evident.Each block 31 has a flange 35a ainst which the side strand 36 is placed.

as s own in Fig. 6, the blocks 31 being slid to theirproper positions,and the strands 36 are then placed against the flanges 35 on each side,and the. ller-pieces 37 are placed between the strand 36 and the ridge38 and fastened onby the screws 39. These fillerpieces are movable onaccount of the different thicknesses of material used in the strands36-, and are adjustable according to the thickness of the strands. Thelevers 29 and 30 are each provided with a pointer 40, these pointers beng adapted to travel on an index-plate 41 so as to rovide for g 'ng these aration of the si e strands 36 dflahe coil -w en the levers 29 and30rare swung apart. I

On-the shaft 15 and adjacent to thelevers.

29 and 36 are the levers 42 and 43. Each of these levers has guides 44in which are arranged to slide t e sleeves 45, these sleeves being shownin detail in 7. In each sleeve 45.is a nut 46 which is provided withmeans for its engagement by a tool, preferably in the form of recesses47 for engage- "ment by a spanner wrench, The nut 46 has a reduced part48 fitting into the sleeve 45, the nut being perforated and providedwith a screw-thread in the perforation so as to receive thescrew-threaded stud 49 which is fastened to a block 50, the block 50providing the supporting means for engaging the end 51 of the strip fromwhich the armature coil is to be made. The referred form of holding theend 51 of t e strip is by securing a leaf 52. at its outside edge sothat it swings on the block 50, this being done by the ivotal connection53. The leaf 52 is 70 provided with an abutment 54 against whichslides-a bar 55 with the cam-face 5 6 thereon, the bar being pivoted asat 57' to a handle 58, which handle is shown particularly in Fig. 1having its end secured as at 59 to the 75' 1e f 52. A bar 60 has acam-surface 61 w ich is adapted to be engaged b the cam surface 56 whenthe bar 55 15 pa led downward by means of the handle 58, these camfaces, when engaging each other, forci the bar 60 sidewise to clamp theend 51 o the strip up against the filler-piece 62, which filler-piece isremovable and can be of any' thickness according to the thickness of thepiece from which the armature coil is made. The filler-piece 62 fitsagainst a flange 63 on the leaf 52, the flange 63, the fillerpiece 62,the bar 60 and the abutment 54 all being perforated to receive a pin 64with a fingerpiece 65 thereon, the bar 55 bein provided with a slot 66throughlwhich t e pin 64 passes, theslot permitting the sliding of thebar 55.

To provide for the varying angles at which the armature coils are madeand to provide ,f or the adjustment to bring about the proper angle atthe end of the coil after it is bent, screws 67 are arranged in the leaf52 andhave their bottom ends bearing on the block 50 so that anyadjustment on the screws will cause the leaf to swing on the fivotalconnection 53 and the angle of the eaf can be adjusted so as to twistthe end 51 of the strip of material of which the coil is made so that itassumes an angle to the perpendicular, irrespective of the distance theends 51 are drawn apart. It will be evident that this adjustment asdescribed for the leaf 52 can be applied to the blocks mounted on therods 32 of the levers 29 and 30. -Each of the levers 29 and 30 has aconnectin -rod.68 ivotally connected as at 69 to sac of the levers,-andconnected as at 70 to the crosshead 71, the crosshead in turn beinmounted on a piston-rod 72 connected with the piston 73 in the cylinder74. A pipe 75 provided with a valve 76 having a handle 77 thereon isadapted to conduct fluid under pressure when the valve 76 is opened sothat the fluid under pressure 129 passes into the cylinder 74 and forcesthe piston 73down, and this carries the crossead 71 with it andconsequentl the connecting-rod The movement ownward, caused by theadmission of fluid under pressure to thecylinder, is limited by the engament of thenoses 7 8 on the connectingr 68 with the adjustable stops 79,which adjustable stops are preferably in the form of screws mounted inthe side strips 16.

S rings 80 are connected with the crosshea 71 and also with the frame ofthe machine to return the levers, the connecting-rods and the piston totheir normal positions when the fluid under pressure is shut off and thecylinder is vented, as will be hereinafter described. A cylinder 81 witha piston 82 is connected by means of the duct 83 to the cylinder 74 sothat the piston 82 goes down at the same time the piston 73 goes down,the piston 82 carrying with it its piston rod 84, the crosshead 85 andthe connecting-rods 86, (see Figs. 4 and 5). The connecting-rods 86 aresecured to the levers 42 and 43 by the pivotal connections 87 and havethe noses 88 to enga e the adjustable stops 89 which are pre erably inthe shape of screws fastened to .the side strips 16 and adjustable so asto regulate the amount of movement of thelevers 42 and 43. Y Struts 90are mounted on the shaft and bear on the tops of the cylinders 74 and 81and thus equalize the pressure and transmit the ressure so that theshaft 15 is not subject to undue strain, neither is the head of eitherof the cylinders, as the upward pressure from the head of each cylinderis communicated to its strut 90, and this transmits an upward pressureagainst the shaft 15 to counteract the downward pressure caused by thepull on the levers 29, 30, 42 and 43 to swing them apart. When the fluidunder ressure is shut off by the valve 7 6f the cylinder can. be ventedby the valve 91 o erated by the handle 92, and the fluid in diecylinders 74 and 81 is forced out by the pistons through the pipe 1 75,the valve 91 and the outlet pipe 92.

(Fig.6). v

93 is the su ply ipe which provides for the supply 0 fluid underpressure to the machine.

The interior construction of the valves is not shown because they are ofthe coinmon form as used. under conditions as above described.

Each block 50 is provided with a screw 94, each screw being adapted toass freely through a perforation in the. on .-plates 95 secured to theends of the levers 42 and 43. Stop-nuts 96 providin means for limitingthe movement of the locks are placed on the screw 94, the nuts 96limitin the outward movement of the blocks an the nuts 97 limiting theinward movement of the blocks when they slide on their levers. Suitabletables 98 and 99 can be conveniently placed on the machine for holdinthe partly prepared and the finished pro nets of the machine. a

The operation of the machine for bending armature coils that aredivergent at one end and closed, at the other end is as follows: Thearmature coil whichcomes flat and U shaped, the two branches ofthe ubeing 'viously slid forward in the This movement of the en ,mitted bythe sliding of the blocks 50 W5 th their leaves 52, this sliding beinglimited by the nuts 97 on the screws 94 engaging the separated by a veryslight opening and he ving a 100 on one end, is placed with its loop 28held by the pin 26 etween the chee kpieces 25 of the endblock 20, theend-bio ck 20 being slid. backas shown in Fig. 6, and

the two strands of the-strip are separated and placed betwecntthefiller-pieces 37 a1 1d the flanges 35 on each of the blocks 31, one ibeing raised slightly higher than the other placed because when thearmature coils are inv an armature they must nest, that is, one strandof one goes over the adjacent strand of the other, and the coils forthis reason 10 not have their opposite sides alined circumferentially.Each of the screws 39 is screwed down to hold the strip securely, andeach of the blocks is fastened by means of its bolt or screw 34 at theproper place on the rod 32 on each of the levers 29 and H0, and then theends 51 of the strip are plac ed securely in each of the leaves 52. Byfirst pushing in the handle 58, which releases the two cam-surfaces 56and 61 of the bars 55 and 60, this being shown in Fig. 8, each of theleaves 52 and its block 50 has been preides 44 as shown in Fig. 6 andthen the andle 58 on each of the leaves is pulled out to securely clampthe end 51 tightly in place. The strip is then in the pos1tion shown inFig. 6. The operator then opens thevalve 76 by means of the lever 77 andfluid under prossnre is admitted through the passage 7 5 into the clinders 74 and 81, and this causes the cross ends 71 and 85 to be forceddownward connecting-rods 86 have drawn back the levers 42 and 43 fromthe positions shown in Fig. 4 to the positions shown in- Fig. 5 and asalso illustrated in Fi 9. The ends 51 of the strip of material om whichthe armature coil is being made are bent outward the required distanceand also at-ihe required ang1e,.being connected to the side strands 99by the obli ue strands 1'11.

end=plates .95. This completes the opeirai' tion of bending the armaturecoil, and; by throwing forward the two levers 58, oneon each leaf 52,and pullingeout the pin 26 by its finger-piece 27, the nt coil can be1removed from the machine while it is-in the position-shown in Fig. 9.The vent valve 91 is then opened, the fluid under pressure has been IMP-is permitted to pass from the cylinders 74 and 81, the springs and 102return the levers to their normal positions shown in Fig. 2 and Fig. 4,and the machine is ready for receiving another strip of material. Itwill be noted that when the filler-pieces 37 strip they need not bechanged when each strip is inserted, since the strip can be easilyslipped down behind each filler-piece.

When it is desired to bend an armature coil as shown in Fig. 11 I firstlock the levers 42 and 43 against any movement by reason of thestandards 103 and the stoppieces 104 being placed under each nose .88 ofthe connecting-rods 86, thereby holding these levers against movement. Ithen-replace each of the sleeves 45 by a plate .105,

these plates supporting, by means of the arms 106 and 107, the block108, which block receives a nut 109 similar to the nut 46 shown in Fig.7, providing for the vertical adjustment of the block 110 which isprovided with pins 111 and 112 which are employed to hold thefiller-pieces 113 and 114 to bind the two ends 51 one above the other,'

and then when the machine is operated by the introduction of fluid underpressure the plates 105 can move inward and the block 20 can moveinward, and the center of the coil being spread apart, it is shaped asshown in Fig. 11 with the side strands 99* and the divergent strands 100being bent as previously illustrated, but the oblique strands 101 beingformed to converge wlth' the ends 51 together as shown in Fig. 11,

apart as shownin Fig. 9.

The index-plate 41 and also the indexplate 115 (see Fig. 10) are used toindicate the throw of the levers and permit their beingstopped at theproper point by the adjustable steps 79 and 89. These-indexplates canhave their top surfaces provided with the distance between the strandsindicated, and the front of the plates can be indexed by degrees. i

It will be evident from this description that the strips can be bentinto coils quickly and cheaply and the angle of the side strands and theends 51 can be regulated by means of the screws 67 tilting the leaves 52to the required angle. In this way it is not necessary to always haveeach of the side strands 99', when bent apart, radial to the shaft 15,but by means of this adjustment they can be madeto assume an angletangential to the shaft 15, and the coils can be bent to fit difl'erentdiameters of armature and also to have different spread so as to providefor different numbers of coils for armatures. Having thus I claim is 1.A bending machine comprising movdescribed my invention, what the twostrands of the strip intermediate 0 iits ends, and means for moving thelast-men- .-tioned blocks away from each other to separate the strandsintermediate of their ends.

have been once adjusted for a certain size 2. A bending machinecomprising movstrip of material,

the last mentioned blocks away from each other to separate'lthef strandsand cause the strands to move the first-mentioned blocks toward eachother. i v

3. A bending machine comprising end blocks movable toward and from eachother, said blocks grasping a U-shaped strip at its loop and at its freeends, levers swinging transversely bet-ween the end-blocks, means .onthe levers for holding the strands between the end-blocks, and means forsaving .ing the levers apart.

4. A bending machine comprising end- .blocks movable towardand fromeachother, fsaid blocks grasping a U-shaped strip at its 1 loop and atits free ends, means for limiting the movement of the blocks toward andfrom ,each other, levers swinging transversely between the end-blocks,means on the levers vfor holding the strands between the endblocks,means for regulating the swing of the levers, and means for swinging thelevers apart.

instead of diverging to throw the ends 51 .loop and at its free-endswhen moved to their limit ofmovement away fro-meach other,

'levers swinging transversely between the end-blocks, means on thelevers for holding the strands between the end-blocks, adjusting meansfor the holding means for regulating the points at. which the holdingmeans engages the strands, and means for swinging the levers apart.

6. A bending machine comprising endblocks movable toward and from eachother, said blocks grasping a U-shaped strip at; its loop and at itsfree ends when moved to their limit of movement away from each other,

levers swinging transversely between the end-blocks, means onthe leversfor holding the strands between the end-blocks, adjusting means for theholding means for regulating the points at which the holding meansengages the strands, means for limitingthe swmg of the levers away fromeach other, and means for swinging the levers a art, the transversemovement of the strands om each other caused by the swinging of thelevers acting through the strands to pull the end-blocks toward eachother.

7. A bending machine comprising endblocks movable toward and from eachother, said blocks grasping a U-shaped strip at its loop and at its freeends, the blocks which grasp the strip at its free ends being alsomovable transversely, means for moving the last mentioned end blockstransversely,

vers supporting the last-mentioned blocks for swingin them apart, meansfor limiting the swing o the levers, a second set of levers, blocks onthe second set of. levers for holding the strands of the strip betweenthe loop and its ends, means for swingin the second set of levers apart,means for imiting the movement of the second set of levers, and meansfor returning the levers'to their normal position when thelever-operating mechanisms are inoperative.

9. A bending machine comprising a frame, a block mounted to slide in oneend of the frame, means on the block for grasping the loop of the U-shaped strip, a pair of sliding blocks mounted on the end of themachine opposite the first-mentioned block, means on the last-mentionedpair of blocks for grasping the free ends of the strip, a shaft mountedin the frame, levers pivoted on'the shaft and arranged to swing apart,blocks on the levers for holding the strands between the loop and thefree ends, means for adjustably securing the blocks on the levers, andmeans for swinging the levers apart to separate the stran s transverselyto cause the end-blocks at the opposite ends of the machine to movetoward each other.

' 10. A bending machine comprising a frame, a block shdably mounted inone end of the frame,-means on the block for receiving the loop of aU-shaped strip, blocks slid- .ab y mounted in the end of. the machineopposite the first-mentioned block, said lastmentioned blocks havingmeans for grasping the'free ends of the strip, a shaft, a cylindermounted beneath the shaft, a piston in the cylinder, in piston-rod onthe iston, levers arranged to swing on the sha adapted to be movedtoward and from each other, means on the levers for holding the strandsbetween the free ends and the loop, connecting-rods secured to thelevers, an operative connection between the connectin -rods and thepiston-rod of the cylinder, an means for admitting fluid under pressureto the cylinder to force the levers apart.

11. A bending machine comprising a frame,

a block slidably nihunted in one end of the frame, means on the blockfor receivin t'. is

loop of a U-shaped strip, blocks' sli ably mounted in the end of themachine opposite the first-mentioned block, said last-mentionedblockshaving means for grasping t? 1e free ends of the strip, a shaft, acyllnder mounted beneath the shaft, a piston in tie cylinder, apiston-rod on the. iston, levers arranged to swing on the sha t adaptedto be moved toward and from each 0th '1', means on the levers forholding the strands between the free ends and the loop, connecting-rodssecured to the levers, an operative connection between theconnecting-rods and the piston-rod of the cylinder, means for almittingfluid under pressure to the cylinder to force the levers apart, meansforventi1 1g the cylinder, and means for returning tv 1e levers andtheir operating mechanism to normal position when the cylinder isvented.

12. Abendin machine comprisinga franc, an end-block slidably mounted inone end ofthe frame, means in the end-block for gras ping the loop ofthe U-shaped strip, apair of blocks mounted to slide in the end of thefran is opposite the first-mentioned block, means on the pair of blocksfor grasping the free ends of the strip, means for limiting theslidingmovement of the blocks at opposite ends of the machine toward eachother, means for swinging the pair of blocks which grasp the ends of thestrip from each other, means for limiting the swinging of the blocks, apair of levers adapted to swing apart, blocks on the levers, means foradjustably securing I the blocks on the levers so as to vary thedistance between the blocks and the same means for swinging the pair ofblocks which grasp the ends of the strip from each othe r, means forlimiting the swinging of the blocks, a pair of levers adapted to swingapart, blocks on the levers, means for 'adjustablysecurin the blocks onthe levers :so as to vary the istance between the blocks and the samelever, means for swinging the levers a art, means for limiting the move-.

ment 0 the levers away from each other, and means for returning thelevers to their normal position when the swinging means of the levers isinoperative.

14. A bending machine comprising a fram e, a block sliding in one end ofthe frame, adjustable means for limiting the sliding pressure is smovement of the block, levers mounted to swing in the end of the machineop osed to the block, a block on each lever, amiiustable means forlimiting the movement of each block on its lever toward and fromthefirstmentioned block, means for swinging the levers apart, a secondset of levers, means for swinging the second set of levers apart, andmeans for returnin all the-levers to their normal position when thelever-operating mechanisms are inoperative.

15. A bending machine comprising a frame, a block slidably mounted inone end of the frame, means in the blockfor securing a stri a shaft inthe frame, levers on the 'sha a block sliding on each lever, means forlimitin the movement of the first-mentioned bloc means for limiting themovement of the blocks on the levers, the blocks being adapted to bemoved toward and from each other, a second set oflevers, blocks on thesecond set of levers, cylinders, operative connections between thecylinders and the levers for forcing them-apart, means for admittingfluid under pressure to the cylinders, and means for returnin the leversto their normal ositions when t e fluid under l fut off and thecylinders are vented.

16. A bending machine comprising a frame,

a block slidably mounted in-one end of the frame, means in the block forsecuring a stri a shaft in the frame, levers on the 'sha t, a blocksliding on each lever, means the movement of the first-menfor limitintioned bloc means for limiting the movement of the blocks on the levers,the blocks moving in a direction toward and from each other, a secondset of levers, blocks on the second set of levers, cylinders, crossheadson the cylinders, means for controlling the adi mission of fluid underpressure to and. from the cylinders, connecting-rods secured to the'crossheads andv to the levers to swing the levers apart when fluid isadmitted to the cylinders, and springs for forcing all the levers totheir closed positions when the cylinders are inoperative.

17. A bending machine comprising a frame, a block slidably mounted inone end of the frame, means in the block for securing a stri a shaft inthe frame, levers on'the 'sha a block sliding on each lever, means forlimiti the movement of the first-mentioned bloc means for limiting themove- ..c eads and to the evers to swing the levers apart when fluid isadmitted to the cylinders, springs for forcing all the levers .on theyshaft, blocks adjustably secure to their closed positions when thecylinders are inoperative, and adjusts ble means on the frame forregulating and limiting the outadapted to swing apart, means on thelevers for engaging the sides of a U-shaped strand,

means for swinging the levers apart, and yielding means for holdingtheloop and the free ends of the U-shaped strand to permit thespreading. of the intermediate portion of thestrip by the levers.

19. A bendlng machine comprising a frame, a shaft in .the frame, leversswin ing on the levers for engaging the strands of a U- shaped strip,means, for swinging the levers apart, means for normally returning thelevers to their closed position, means for limit ing the outward swin.of the levers, and yielding means for hot ing the loop and the freeends of the U-shaped strand.

20. A bending machine comprising a frame, a shaft'on the frame,leversarranged to swing on the shaft, blocks on the levers, means foradjustin the blocks on the levers longitudinal with t e shaft, acylinder under the levers, connecting-rods secured to the levers andconnected with the cylinder to be operated thereb when fluid underpressure is admitted to tile cylinder, means for limiting the-movementof the connecting-rods, means for returning thelevers to their normalposition when the cylinder is vented, and yielding means for holding theloop and the free ends of. a U-shaped strip en- 'gaged bythe blocks onthe levers.

- 21. A bending machine comprising a frame, a shaft on the frame, leversarranged to swin on the shaft, blocks on the levers, means or adjustinthe blocks on the levers longitudinal with te shaft, a cylinder underthe levers, connecting-rods secured to the levers and connected with thecylinder to be operated thereb when fluid under pressure is admitted tote cylinder, means for limiting the movement of the connectin -rods,means for returning the levers to their normal position when thecylinder is vented, blocks sliding in the machine, stop-plates on theframe, screw-threaded rods on the blocks, nuts on the rods for engagingthe stop-plate therebv limiting the movement of the side strands, meansfor adjusting the the strip, means ends of a swinging leaves to regulatethe angle of the side strands, and means for forcing the levers apart. 1

23. A bending machine comprising a frame, a shaft in the frame, leversswinging on the shaft, blocks on the levers for engaging the sidestrandsof a U-shaped strip, a movable block for engaging the loop of the strip,means for forcing the levers apart, swinging leaves on the blocks forengaging the side strands, means for adjusting the swinging leaves toregulate the angle of the side strands, means apart, and means forlimiting the outward movement of the levers.

24. A bending machine comprising a frame, a shaft in the frame, ablockon one end of the frame and sliding therein, means on the block forgrasping the loop of a U- shaped stri levers on the shaft, means onthe-levers or gras ing the side strands of the strip, means or tiltingthe grasping means, and means for swinging the levers apart.

, 25. A bending machine comprising a frame, a shaft in the frame, ablock on one end of the frame and sliding therein, meanson the block forgrasping the loop of a U- shaped stri levers on the shaft, means on thelevers or gras ing the side strands of or tilting the grasping means,means for swinging the levers apart,

means for limiting the outward movement of the levers, and means forreturning the levers to their closed position when the swinging means isinoperative.

26. A bending machine compising a frame, a shaft in the frame, bloc onthe o posite ends of the machine,-means on the b ocks for rasping theloo and the free I -shaped strip, evers for so porting the blocks on thefree ends of t e strip, a second set of levers, adjustable blocks on thesecond set of levers for grasping the side strands of the strip, sidestrips on the a machine, adjustable stops onthe side strips ofthe'machine, cylinders mounted beneath the shaft, pistons andpiston-rods in the cylinders, crossheads on the piston-rods, con,-ne'ctin -rods secured to the crossheads and to the evers, means foradmitting fluid under pressure to the cylinders, means for venting thecylinders, and means on the connecting-rods for engaging the adjustablestops for limiting the swing of the levers.

- 27. A bending machine compising. a

frame, a shaft in the frame, bloc on the o posite ends of the machine,means on the 'b ocks for grasping the 100 and the free ends of a -shapedstrip, evers for supporting the blocks on the free ends of t e i astrip, a second set of'levers, adjustable blocks on the second set oflevers for grasping the side strands of the strip, side strips on themachine, adjustable stops on the slde strips or forcing the levers ofthe machine, cylinders mounted beneath the shaft, pistons andpiston-rods in the cylinders, crossheads on the piston-rods,connecting-rods secured to the crossheads and a to the levers, means foradmitting fluid under pressure to the cylinders, means for enting thecylinders, means onthe connecting-l,

rods for engaging the adjustable stops for, limiting the swin of thelevers, and spin connected to the rame and to the crossh ea forreturning the levers to their normal positions when the cylinders arevented.

'28. A bending machine' comprising a frame, a shaft in the frame,blockson the oppositeends of the machine, means on the blocks forgrasping the loop and the free ends of a U-shaped strip, levers for sup]vorting the blocks on the free ends of the strip, a second set oflevers, adjustable blocks on the second set of levers for grasping theside strands of the strip, side strips or the machine, adjustable stopson the side strips of the machine, cylinders mounted beneath the shaft,pistons and piston-rods in the cylinders, crossheads on thepiston-:rods, connecting-rods secured to the crossh eads and to thelevers, means for admitting fluid under pressure to the cylinders, meansfor venting the cylinders, means on the connecting-rods for engaging theadjustable stops for limiting the swing of the levers, springsconnectedto the frame and to the crossheads for returning the levers totheir normal positions when the cylinders are vented,

and struts bearing on the ends of the cylinders and on the shaft.

29. A bending machine comprising a frame, a block sliding in one end oithe frame, cheek-pieces on the block having 'alined perforations, adetachable pin in the perforations, the cheek-pieces and the pincooperating to secure the loop of-a U-sha ed strip, sliding blocksmounted on the en of the machine opposite the first-mentioned block,manually operated means on the lastmentioned blocks for gra ing the freeends of the strip, screw-threa ed bolts projecting from the blocks, nutsonthe bolts, atop plates adapted to be engaged by the nuts or limitingthe movement of the blocks a shaft in the machine extendingsubstantially arallel with the strip when it is in the ton-rods of thecylinders, connecting-rods 1 p evers,

secured tothe'crossheads and to the inders, springs for returning thelevers to means for controlling the admission and outletof fluid underpressure to the cyl-' their normal posit-ion when the cylinders arevented, and adjustable means on the .frame for engaging the levers forlimiting .their outward movement.

30. A bending machine comprising a frame, a block sliding in one end ofthe frame, cheek-pieces on the block having alined perforations, adetachable pin in the perforations, the cheek-pieces and the pincooperating to secure the loop of a U-shaped strip, sliding blocksmounted on the end of the machine opposite the first-mentioned block,manually operated means on the last- 'mentioned blocksfor grasping-thefree ends of the strip, screw-threaded bolts projecting from the blocks,nuts on the bolts, stopplates adapted to be engaged by the nuts forlimiting the movement of the blocks, a shaft in the machine extendingsubstantially parallel with the strip when it is I in. the

blocks, a set of levers mounted on the shaft the erossheads and to thelevers, means for controlling the admission and outlet of fluid underpressure to the cylinders, springs for returning the levers to theirnormal osition when the cylinders are vented, ad ustable means on theframe for engaging the levers for limiting their outward movement, andmeans onthe blocks on the levers for tilting the strands.

31. A bending machine comprising a frame, blocks arranged to slide onthe frame, means for moving the blocks apart, a sliding bar on eachblock, a handle for operating the slidin bar, a fixed bar on each block,cam-sur aces on the opposed bars adapted to engage each other when thesliding bar is operated, a filleriece adjustably secured on the block,the xed .bar

and the filler-piece being adapted to grasp the free ends of a U-shapedstrip, yielding means for holding the loop of the U-shaped strip, blocksfor engaging the strands of the strip between its free ends and itsloop, and means for operating the last-mentioned blocks to pull thestrands apart intermediate of the free ends and the loop of the strip.

In testimony, that I claim the foregoing,

I have hereunto set my hand this 10th day of June 1911.

GARL E. ANDERSON.

' Witnesses:

WM. H. CAMFIELD, M. A. JoHNsoN.

